Hello, everyone, I have a problem using fork/exec, I have a program that
launches other program:
//spawner.exe
#include
#include
int main(int argc, char* argv[])
{
pid_t pid = 0;
if (argc < 2)
{
fprintf(stderr, "Usage: spawner executable [arguments]\n");
return -1;
}
pid = fork();
if (pid == 0)
{
execv(*(argv + 1), argv + 1);
}
sleep(10);
return 0;
}
I use it to launch a program compiled using MSVC++ 2005:
//testproj.exe
#include
int main(int argc, char *argv[])
{
Sleep(1);
return 0;
}
So, I'm using first program like this:
./spawner.exe testproj.exe
It starts, everything is ok, but in windows TaskMan I see something like
this:
spawner.exe
spawner.exe
testproj.exe
I have 2 copies of spawner.exe running, It seemed to me so, but after I ran
"ps -W" under cygwin I got:
PID PPIDPGID WINPID TTY UIDSTIME COMMAND
257629282576 3260 con 1003 12:06:07 .../spawner
242425762576 3472 con 1003 12:06:07 .../testproj
3472 0 0 3472?0 12:06:07
C:\cygwin\...\testproj.exe (where did it come from ???)
It looks like second spawner.exe is not actually a spawner.exe, but another
testproj.exe. Note that first testproj and second testproj have the same
WINPID, but different PIDs and the PID of second testproj = WINPID of first
testproj.
After that I've created another program testproj_cyg.exe similar to
testproj.exe but compiled it with cygwin:
//testproj_cyg.exe
#include
int main(int argc, char* argv[])
{
sleep(10);
return 0;
}
And ran:
./spawner.exe testproj_cyg.exe
And everything was ok, I had one copy of spawner.exe and one copy of
testproj_cyg.exe
So, why does this happen, why there's a second testproj.exe in memory ?
It's compiled with MSVC++ 2005, is that a problem for cygwin's fork/exec ?
why ?
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/
